サーメット工具の耐欠損性に関する研究(第3報) : 工具の熱き裂に対する抵抗性について

概要

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Thermal crack resistance of three cermet tools in intermittent cutting operations has been studied with regard to thermal and mechanical properties of tool materials at high temperatures. The resistance of each cermet tools was determined by interrupted turning of steel (S 45 C) under small cutting time/non-cutting time ratio. At higher cutting speeds above 3.33 m/s, extremely high compressive stresses (greater than 3.0 GPa) occurs on the tool chip interface. As the compressive yield strength of the tool material is reduced rapidly at higher temperatures above 1073 K, the compressive stresses developed during cutting may exceed the yielding limit and plastic deformation occurs on the tool face. During cooling at each cutting cycle, a shortening occurs on the tool face and a tensile stress develops causing comb cracks (thermal crack). As the result, the cermet tool possessing high plasticity at elevated temperatures, such as TiN added type cermet, shows weak resistance to thermal crack formation.
公益社団法人精密工学会の論文
1984-07-05